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11. Hydrodynamics of ammonoids

Author

Ren, Qilong and Carley, Michael

Subjects
621, Ammonoids, Hydrodynamics, Added-mass
Published
2018

20. Aperture Fine‐Tuning in Cage‐Like Metal–Organic Frameworks via Molecular Valve Strategy for Efficient Hexane Isomer Separation.

Author

Chen, Rundao, Zheng, Fang, Li, Jiaqi, Liu, Ying, Zhou, Fangru, Sun, Haoran, Yang, Qiwei, Zhang, Zhiguo, Ren, Qilong, and Bao, Zongbi

Subjects
METAL-organic frameworks, MOLECULAR sieves, DENSITY functional theory, VALVES, ADSORPTION isotherms
Abstract

Cage‐like metal–organic frameworks (MOFs) are promising for hexane isomer separation, but their aperture sizes are difficult to control precisely. Herein, a molecular valve strategy is proposed to fine‐tune the aperture of cage‐like MOFs, thereby enhancing their separation performance for hexane isomers. Three novel isostructural cage‐like MOFs, namely Cu‐MO4‐TPA, are synthesized using different oxometallate anions (MO42−, M = Cr, Mo, and W) and the ligand tri(pyridin‐4‐yl)amine (TPA). The different oxometallate anions induce varying degrees of twisting in the TPA ligand, leading to sub‐angstrom tuning in the aperture size of the MOFs. The materials can separate hexane isomers based on their degree of branching, with the smallest aperture material (Cu‐MoO4‐TPA) showing molecular sieving of di‐branched isomers. Adsorption isotherms, kinetic, and breakthrough measurements, Monte Carlo, and density functional theory calculations confirm the aperture size differences result in superior separation of hexane isomers by molecular sieving on Cu‐MoO4‐TPA. The results demonstrate the effectiveness of molecular valve strategy for fine‐tuning MOF aperture size for selective separation applications. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Simultaneous interlayer and intralayer space control in two-dimensional metal−organic frameworks for acetylene/ethylene separation

Author

Shen, Jin, He, Xin, Ke, Tian, Krishna, Rajamani, van Baten, Jasper M., Chen, Rundao, Bao, Zongbi, Xing, Huabin, Dincǎ, Mircea, Zhang, Zhiguo, Yang, Qiwei, Ren, Qilong, Shen, Jin, He, Xin, Ke, Tian, Krishna, Rajamani, van Baten, Jasper M., Chen, Rundao, Bao, Zongbi, Xing, Huabin, Dincǎ, Mircea, Zhang, Zhiguo, Yang, Qiwei, and Ren, Qilong

Abstract

© 2020, The Author(s). Three-dimensional metal−organic frameworks (MOFs) are cutting-edge materials in the adsorptive removal of trace gases due to the availability of abundant pores with specific chemistry. However, the development of ideal adsorbents combining high adsorption capacity with high selectivity and stability remains challenging. Here we demonstrate a strategy to design adsorbents that utilizes the tunability of interlayer and intralayer space of two-dimensional fluorinated MOFs for capturing acetylene from ethylene. Validated by X-ray diffraction and modeling, a systematic variation of linker atom oxidation state enables fine regulation of layer stacking pattern and linker conformation, which affords a strong interlayer trapping of molecules along with cooperative intralayer binding. The resultant robust materials (ZUL-100 and ZUL-200) exhibit benchmark capacity in the pressure range of 0.001–0.05 bar with high selectivity. Their efficiency in acetylene/ethylene separation is confirmed by breakthrough experiments, giving excellent ethylene productivities (121 mmol/g from 1/99 mixture, 99.9999%), even when cycled under moist conditions.

Published
2022

37. beta-Cyclodextrin-derived Room Temperature Macromolecular Ionic Liquids by PEGylated Anions

Author

Ke, Yuqi, Zhang, Weiyi, Suo, Xian, Ren, Qilong, Xing, Huabin, Yuan, Jiayin, Ke, Yuqi, Zhang, Weiyi, Suo, Xian, Ren, Qilong, Xing, Huabin, and Yuan, Jiayin

Abstract

A series of cyclodextrin-derived room temperature macromolecular ionic liquids carrying rather low glass transition temperatures of -20 to -40 degrees C are synthesized via sequential esterification, quaternization, and anion metathesis reactions. In addition to being ionic in nature, they are viscous liquids at room temperature with more fluidic behavior at elevated temperatures. They serve as a solvent for organic dyes or iodine separation via a liquid-liquid extraction approach. This strategy is useful for the development of various sugar (macro)molecule-based functional ionic liquids as well as macromolecular ionic liquids.

Published
2020
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50. Ultrahigh-Purity and Productivity Separation of CO2and C2H2from CH4in Rigid Layered Ultramicroporous Material

Author

Jin, Yuanyuan, Ke, Tian, Xu, Guihong, Li, Jinjian, Jiang, Zhixin, Fan, Rongrong, Zhang, Zhiguo, Bao, Zongbi, Ren, Qilong, and Yang, Qiwei

Abstract

Efficiently obtaining both high-purity gas-phase and adsorbed-phase products in a single physisorption process presents the challenge of simultaneously achieving high selectivity and uptake and rapid diffusion in adsorbents. With a focus on natural gas purification and high-purity acetylene production, we report for the first time that the synergistic ligand/anion binding mode and multiple diffusion pathways in a robust 2D layered ultramicroporous framework (ZUL-100) enable unprecedented carbon dioxide/methane and acetylene/methane separation performance. Taking advantage of its rich anion, functional ligand ,and rigid 3D interpenetrated ultramicroporous channels, ZUL-100 achieved record IAST selectivities for equimolar carbon dioxide/methane (3.2 × 105) and acetylene/methane (1.7 × 1010) mixtures, accompanied by record dynamic uptakes of carbon dioxide (3.10 mmol/g) and acetylene (4.79 mmol/g), respectively. The strong affinity and fast mass transfer of carbon dioxide and acetylene on ZUL-100 were systematically elucidated by a combination of in situ FTIR, single-crystal XRD, kinetic tests, and DFT-D adsorption/diffusion modeling. In particular, high-purity (≥99.999%) methane and carbon dioxide (acetylene) can both be obtained on ZUL-100 through a single adsorption–desorption cycle, with exceptional productivity (2.81–4.22 mmol/g of methane, 2.96 mmol/g of carbon dioxide, and 4.31 mmol/g of acetylene) and high yield (95.5% for carbon dioxide and 90.0% for acetylene).

Published
2024
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